Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: A qual distrito Bill Hefner pertence?
 ###Tabelas: CREATE TABLE performances_and_result (performances_and_result_id AUTO_INCREMENT PRIMARY KEY, Week # VARCHAR, Theme VARCHAR, Song choice VARCHAR, Original artist VARCHAR, Order # VARCHAR, Result VARCHAR) CREATE TABLE north_carolina (north_carolina_id AUTO_INCREMENT PRIMARY KEY, District VARCHAR, Incumbent VARCHAR, Party VARCHAR, First elected INT, Status VARCHAR, Opponent VARCHAR) CREATE TABLE jersey_progression (jersey_progression_id AUTO_INCREMENT PRIMARY KEY, Stage INT, Winner VARCHAR, General classification VARCHAR, Points classification VARCHAR, Mountains classification VARCHAR, Sprints classification VARCHAR, Team classification VARCHAR) CREATE TABLE singles:_6_2_titles_4_runner-ups (singles:_6_2_titles_4_runner-ups_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Year INT, Championship VARCHAR, Surface VARCHAR, Opponent in the final VARCHAR, Score in the final VARCHAR) CREATE TABLE zamora_trophy (zamora_trophy_id AUTO_INCREMENT PRIMARY KEY, Goalkeeper VARCHAR, Goals INT, Matches INT, Average INT, Team VARCHAR)  
SELECT District FROM north_carolina WHERE Incumbent = Bill Hefner